# Email on Acid vs Testmail.app

**Leader by vioscaleAI score:** Testmail.app

| Attribute | Email on Acid | Testmail.app |
|---|---|---|
| **vioscaleAI score** | 57.7 (64% (medium)) | 69.9 (45% (low)) |
| content.faq | `[{"answer":"Tests email campaigns across 100+ email clients and devices to identify rendering issues, validate content for inbox compatibility, check accessibility compliance, and detect deliverability problems before sending. It is indexed under Email Testing Dev.","source":"https://www.emailonacid.com/pricing/","question":"What is Email on Acid?","confidence":0.6},{"answer":"Email on Acid is a paid product; published pricing starts at $0.15. It is sold across 3 plans (Basic, Premium and Custom). There is no free tier. Prices are published openly on the vendor's own pricing page. Pricing changes often, so verify at source before relying on it.","source":"https://www.emailonacid.com/pricing/","question":"How much does Email on Acid cost?","confidence":0.6},{"answer":"We have confirmed browser-based access to Email on Acid. That is the extent of what we could verify from public sources, so it may well offer desktop or mobile clients we have not indexed.","source":"https://www.emailonacid.com/pricing/","question":"What platforms does Email on Acid support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for Email on Acid, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://www.emailonacid.com/pricing/","question":"Can Email on Acid be self-hosted?","confidence":0.6},{"answer":"We have independently confirmed SOC 2, ISO 27001 and GDPR for Email on Acid. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Email on Acid not holding them. Always confirm compliance directly before you rely on it.","source":"https://www.emailonacid.com/blog/article/email-marketing/gdpr-compliance/","question":"What security certifications does Email on Acid have?","confidence":0.7},{"answer":"Email on Acid is available worldwide. Its primary market is the United States.","source":"https://www.emailonacid.com/pricing/","question":"Where is Email on Acid available?","confidence":0.5}]` | `[{"answer":"A cloud-based email testing service that provides isolated mailboxes accessible via API for automated testing of email deliverability, OTP flows, and end-to-end email validations in CI/CD pipelines. It is indexed under Email Testing Dev.","source":"https://testmail.app/pricing/","question":"What is Testmail.app?","confidence":0.6},{"answer":"Testmail.app offers a free tier, so you can start without paying. Paid plans start at $9 per year. Prices are published openly on the vendor's own pricing page. Pricing changes often, so verify at source before relying on it.","source":"https://testmail.app/pricing/","question":"Is Testmail.app free?","confidence":0.6},{"answer":"We have confirmed browser-based access to Testmail.app. That is the extent of what we could verify from public sources, so it may well offer desktop or mobile clients we have not indexed.","source":"https://testmail.app/pricing/","question":"What platforms does Testmail.app support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for Testmail.app, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://testmail.app/pricing/","question":"Can Testmail.app be self-hosted?","confidence":0.6},{"answer":"We have confirmed 3 integrations for Testmail.app, including Microsoft Entra ID, Okta and OneLogin. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://testmail.app/pricing/","question":"What does Testmail.app integrate with?","confidence":0.6},{"answer":"We have independently confirmed GDPR for Testmail.app. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Testmail.app not holding them. Always confirm compliance directly before you rely on it.","source":"https://testmail.app/blog/email-regulatory-compliance-simplified/","question":"What security certifications does Testmail.app have?","confidence":0.7},{"answer":"Testmail.app is available worldwide. Its primary market is the United States.","source":"https://testmail.app/pricing/","question":"Where is Testmail.app available?","confidence":0.5}]` |
| deployment.options | `{"cloud":true}` | `{"cloud":true}` |
| description.long | Tests email campaigns across 100+ email clients and devices to identify rendering issues, validate content for inbox compatibility, check accessibility compliance, and detect deliverability problems before sending. | A programmable email testing service that provides temporary email addresses and mailboxes for automated testing, allowing developers to validate email delivery and functionality without affecting real customers. |
| features.capabilities | `{"open_source":false,"sms_testing":false,"api_assertions":true,"spam_score_check":true,"ci_cd_integration":false,"rendering_preview":true,"multi_user_inboxes":false,"production_sending_addon":false,"blocklist_deliverability_check":true}` | `{"api_assertions":true,"spam_score_check":true,"ci_cd_integration":true,"rendering_preview":true,"multi_user_inboxes":true}` |
| integrations.count | - | 3 |
| integrations.list | - | `[{"name":"Microsoft Entra ID"},{"name":"Okta"},{"name":"OneLogin"}]` |
| market.availability | `{"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"hqCountry":"CA","primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"web":true}` | `{"web":true}` |
| pricing | `{"type":"subscription","plans":[{"free":false,"name":"Basic","summary":"$99/month, $0.15 per preview overage","features":["1,000 email previews per month","100+ email preview clients and devices","Unlimited users","API access","Overage charges for additional previews"],"commitment":"monthly","components":[{"kind":"fixed","amount":99,"period":"month","currency":"USD"},{"per":{"qty":1,"unit":"preview"},"kind":"metered","amount":0.15,"currency":"USD"}],"description":"Email preview testing with API access","contactSales":false,"includedLimits":{"previews":"1,000/mo","clients_devices":"100+"}},{"free":false,"name":"Premium","summary":"$199/month","features":["2,000 email previews per month","100+ email preview clients and devices","Unlimited users","Accessibility tests (WCAG 2.2 / European Accessibility Act compliance)","HTML code analysis","Link and image validation","Spam content checks across major ISPs"],"commitment":"monthly","components":[{"kind":"fixed","amount":199,"period":"month","currency":"USD"}],"description":"Full QA suite with accessibility testing and content analysis","contactSales":false,"includedLimits":{"previews":"2,000/mo","clients_devices":"100+"}},{"free":false,"name":"Custom","summary":"Custom pricing","features":["Custom preview allotments","Phone and chat support","Dedicated support documentation"],"description":"Custom preview allotments and enterprise support","contactSales":true}],"summary":"From $99/month. 7-day free trial.","currency":"USD","freeTier":false,"sourceUrl":"https://www.emailonacid.com/pricing/","retrievedAt":"2026-08-25T12:11:37.247Z","freeTrialDays":7,"startingPrice":{"amount":99,"period":"month","currency":"USD"},"billingPeriods":["month"]}` | `{"type":"subscription","plans":[{"free":true,"name":"Free","summary":"$0/month forever","features":["100 emails/month","Unlimited users, email addresses, and mailboxes","1 day retention"],"components":[{"kind":"fixed","amount":0,"period":"month","currency":"USD"}],"description":"Forever free plan","contactSales":false,"includedLimits":{"emails":"100/month"}},{"free":false,"name":"Essential","summary":"$9/month (annual) or $12/month (monthly)","features":["10,000 emails/month","1-3 days retention","One random namespace","Full API access"],"components":[{"kind":"fixed","amount":9,"period":"month","currency":"USD"}],"description":"For small projects","contactSales":false,"includedLimits":{"emails":"10,000/month","retention":"1-3 days"}},{"free":false,"name":"Pro","summary":"$29/month (annual) or $39/month (monthly)","features":["50,000 emails/month","Unlimited custom namespaces","Visual viewer","Priority support"],"components":[{"kind":"fixed","amount":29,"period":"month","currency":"USD"}],"description":"Most popular plan","contactSales":false,"includedLimits":{"emails":"50,000/month","retention":"1-30 days"}},{"free":false,"name":"Enterprise","summary":"$89/month (annual) or $129/month (monthly)","features":["1,000,000 emails/month","Custom retention","SSO with SAML 2.0 or OIDC","Enterprise invoicing","99.99% uptime SLA"],"components":[{"kind":"fixed","amount":89,"period":"month","currency":"USD"}],"description":"For power users","contactSales":false,"includedLimits":{"emails":"1,000,000/month"}},{"free":false,"name":"Plus","summary":"$269/month (annual) or $299/month (monthly)","features":["10,000,000 emails/month","All Enterprise features","Unlimited custom domains","Custom contracts with enterprise compliance support","SCIM support"],"components":[{"kind":"fixed","amount":269,"period":"month","currency":"USD"}],"description":"Unlimited - best of everything","contactSales":false,"includedLimits":{"emails":"10,000,000/month"}}],"summary":"Free forever (100 emails/month) plus 14-day free trial. Paid plans from $9–$269/month.","currency":"USD","freeTier":true,"sourceUrl":"https://testmail.app/pricing/","retrievedAt":"2026-10-12T15:28:41.272Z","freeTrialDays":14,"startingPrice":{"amount":9,"period":"month","currency":"USD"},"billingPeriods":["month","year"]}` |
| pricing.free_tier | no | yes |
| pricing.model | commercial | freemium |
| pricing.price_level | high | low |
| pricing.starting_price | `{"amount":99,"currency":"USD"}` | `{"amount":9,"currency":"USD"}` |
| pricing.transparent | yes | yes |
| reliability.sla_pct | 99.9 | 99.99 |
| reliability.status_page | - | yes |
| security.gdpr | yes | yes |
| security.iso27001 | yes | - |
| security.soc2 | yes | - |
| security.trust_center | - | https://testmail.app/blog/email-regulatory-compliance-simplified/ |

## Capabilities (Email Testing Dev)

| Capability | Email on Acid | Testmail.app |
|---|:--:|:--:|
| **Capabilities** |  |  |
| API assertions | ✓ | ✓ |
| Rendering preview | ✓ | ✓ |
| Spam score check | ✓ | ✓ |
| Blocklist deliverability check | ✓ | - |
| SMS testing | ✗ | - |
| Production sending addon | ✗ | - |
| Ci cd integration | ✗ | ✓ |
| Multi user inboxes | ✗ | ✓ |
| Open source | ✗ | - |

*Source: vioscaleAI. Generated 2026-10-16T19:19:09.028Z. "-" = undocumented, not absent.*